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/*-
* Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_SHRINKER_H_
#define _LINUXKPI_LINUX_SHRINKER_H_
#include <sys/queue.h>
#include <linux/bitops.h>
#include <linux/gfp.h>
struct shrink_control {
gfp_t gfp_mask;
unsigned long nr_to_scan;
unsigned long nr_scanned;
};
struct shrinker {
unsigned long (*count_objects)(struct shrinker *, struct shrink_control *);
unsigned long (*scan_objects)(struct shrinker *, struct shrink_control *);
int seeks;
unsigned int flags;
void * private_data;
long batch;
TAILQ_ENTRY(shrinker) next;
};
#define SHRINK_STOP (~0UL)
#define DEFAULT_SEEKS 2
#define SHRINKER_REGISTERED BIT(0)
#define SHRINKER_ALLOCATED BIT(1)
struct shrinker *linuxkpi_shrinker_alloc(
unsigned int flags, const char *fmt, ...);
int linuxkpi_register_shrinker(struct shrinker *s);
void linuxkpi_unregister_shrinker(struct shrinker *s);
void linuxkpi_shrinker_free(struct shrinker *shrinker);
void linuxkpi_synchronize_shrinkers(void);
#define shrinker_alloc(flags, fmt, ...) \
linuxkpi_shrinker_alloc(flags, fmt __VA_OPT__(,) __VA_ARGS__)
#define shrinker_register(shrinker) \
linuxkpi_register_shrinker(shrinker)
#define shrinker_free(shrinker) \
linuxkpi_shrinker_free(shrinker)
#if defined(LINUXKPI_VERSION) && LINUXKPI_VERSION >= 60000
#define register_shrinker(s, ...) linuxkpi_register_shrinker(s)
#else
#define register_shrinker(s) linuxkpi_register_shrinker(s)
#endif
#define unregister_shrinker(s) linuxkpi_unregister_shrinker(s)
#define synchronize_shrinkers() linuxkpi_synchronize_shrinkers()
#endif /* _LINUXKPI_LINUX_SHRINKER_H_ */
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